Wheeled scraper



F. S.A DOBSON WHEELED SCRAPER Dec. 6, 1938.

2 Sheets-Sheet 2 Filed arch 16, 1936 Patented Dec. 6, 1938 UNITED STATES PATENT oFFlcE i '2.129.261' l' M... pp" ca ons cirim. (01. sti-1u) o. me

The present invention is an improved wheeled scraper that can be attached to 'any type tractor or truck and operated by said tractor or truck operator.

The objects ofthe improvements are:

First, to provide a four sided scraper box as one unitv with immovable sides or en ds to which the wheels, hitch, and all other movable parts may be attached, thereby doing away withH a heavy frame structure. n

Second, to provide a means of loading the scraper through its bottom by moving only a part of its bottom.

Third, to provide a means of unloading all the material from the scraper, through its bottom. at once, or part of the load at different places, by moving only a part of its bottom.

Fourth, nin the case of large Scrapers, to pro' vide a means of loading the scraper more quickly. by using any number of its bottomsections for loading purposes.

One form of the invention is illustrated in the accompanying drawings in which Figures 1 and 2 are vertical longitudinal sectional views ofl a small scraper, with the bottom cut in two sections or slats as it appears after one side is removed. Figure 3 is a sectional vew'taken on line 3-3 of Figure 1 looking in the direction of the arrows. Figure 4, a plan view. Figure 5, an enlarged detail of bucket I2 and its attachments. Figures 6 and 'lare enlarged details of guides I5, and plate I6 with its attachments.

A four sided box I without top or bottom has two rear wheels 2, 2 attached by an axle 3 to the rear end and outside of the box. A beam or bar 4 is attached rigid to the front end and ouside of box I. In the case of a two wheeled scraper, the front end of bar 4 is attached to the rear hitch of any tractor by pin 5 in such a way' that it will support the front end of box I and the scraper will move on its two rear wheels. In the case of a three wheeled scraper, wheel 6 is attached to bar 4 by swivel 1, Figure 1, the wheel 6 will support the iront end of box I and the front end of bar 4 is attached to the rear hitch of any tractor in any manner and the scraper will move on its three wheels 2, 2 and 6.

In the case of a four wheeled scraper l (not shown on the drawings) the fifth wheel` common to all four wheeled vehicles is attached to bar l to which the two front wheels of the scraper are attached through a front axle. The towing vehicle is attached to the front axle.

Along the bottom and inside of the two sides of box I square, rectangular or angle bars I, I

are attached to box I. Across the top o! box I, hollow pipes or round bars I! and II) with each end flattened and bent down are attached one end on each side`and outside of box I. Across the bottom of box l a Vhollow pipe or round bar II, having both ends flattened and bent up, is attached to the outside of box I so that part of the diameterof pipe II extends above the bot-n tom of box I, pipe II being fiatened also where it contacts bars I, 8.

Bucket I2 has a bottom and two special shaped sides as shown in Figures 1, 2 and 5, but has no ends or top. its cutsidewidth being the same as the distance between the two opposite inside edges of ,bars I, 8. The length of bucket I2 is such that the front edges of the bottom and sides engage the inside faces of the front end of box I in any position and the rear end of bucket` I2 will rest on pipe II.

Round stub shafts I3, I3 are attached one near andputside of each upper front corner of the two sides of bucket I2 and extend outward to contact theinside face of the two opposite sides of box l.

Round stub shafts It, I4 are attached in the same manner as shafts I3, I3, but near the upper rear corners of the two sides of bucket I2.

Guides I5 are square or rectangular bars attached to the inside face of the two opposite sides of box I and slightly back of pipe II; the bottom of guides Ii rests on bars 8, 8 and extend upward to a point near the top of box I. The thickness and width of guides I5 are less than the width and thickness of bars 8, 8.

Flat plate I6 rests on bars 8, 8, its width allows it to contact guides I5, its length is such that its front end rests on pipe II and its rear end contacts the inside face of the rear end of box I. Round stub shafts I1,*I1 are attached one near each of the front corners of plate I6 and extend outward to contact the two opposite sides of box I and between the four guides I5 and stub shafts or bars I8, I8 are attached one near each rear corner of plate I6 and extend outward to contact the inside face of the two sides of box I.

A cable, rope or chain I9 is attached to both shafts I3, I3 and extends up and over pipe 9 (Figures 1, 2, and 4) andthence to a windlass 2I (Figure 1).

A cable, rope or chain 2D is attached to shafts' Il, I1 and extends up and over pipe I0 (Figures 1, 2, 3, and 4) thence'to rope I9 (Figures l, 2, 3,r and 4) to which rope 20 is attached so that it will hang loose while bucket I2 is digging (Figure 1) and will be taut when the bottom of bucket [s is level with the bottom of box n (Figure 2).

'Ihere are numerous devices on the market for winding and unwinding rope -I 8 that may be set either on the scraper or tractor within easy reach of the tractor operator and operated by him either by hand or from a power take on direct from the tractor engine.

-I do not claim anything new in a windlass. but to show how my scraper operates, I show in Figure la simple windlass 2I to which the upper end of chain I8 is attached. f Windlass 2| is turned by shaft 22 which is turned by crank 28 and windlass 2| is held in any position by sprocket 24 and dog 2l.

Figure l shows the position of the scraper while it is being loaded, bucket I2 is lowered until it engages the material to be loaded, rope 28 slackens and hangs loose, the front edge of the bottom of. bucket I2 is sharpened and as the scraper is pulled forward 'by the tractor, bucket I2 cuts and picks up the loose material which is forced back onto plate I8 and into and filling up box I. To prevent bucket I2 being forced back out' of place while it is digging, square or rectangular bars or lugs 28, 28 are attached to the inside face of each side of box I and just back of but contacting shafts I 4, Il and at the proper angle to prevent the rear end of bucket I2 from being forced back or upward, (Figures l, 2, 4, 5, and 6).

When box I is filled, windlass 2i is turned, winding up cable Il, taking up the slack in rope 2l and raising the front end of bucket I2. When the bottom .of bucket I2 is level with the bottom of box I and bars 8, 8, windlass 2I is locked in place by dog 2l and the scraper is ready to be moved to the place of unloading (Figure 2) both ropes I8 and 28 being taut.

When the place of unloading is reached, windlass 2I is again turned, winding up both ropes I8 and 2l and raising the front ends of buckets I2 and plate I8, the front end of bucket I2 will contact the front side of box I and move up, but shafts I I, I4 will contact bars 8, 8 and slide forward. Shafts I1, I1 will contact guides I5 forcing the front end of plate II to raise up while the rear end of plate I6 contacts bars 8, 8 and slides forward. This creates openings in the bottom of box I allowing the material to slide out as shown in dotted lines in Figure 2.

When all the material is unloaded, windlass 2I is locked in place by dog 25 (Figure 2) and the scraper moved to the place of loading again.

'I'he ends of shafts I2-I3, I4-I4, I1-I1 and I8-I8 contact the inside face of box I- at all times, holding bucket I2 and plate I6 in the correct sideway position.

When the scraper reaches the place of loading again, dog 2l is raised, freeing shaft 22 and windlass 2I and the weight of bucket I2 and plate I 8 will cause windlass 2l to unwind itself.

Bucket I2 being released, its own weight will force it down, but its front edge contacts the inside face of the front end of box I, causing the front of bucket I2 to fall or slide straight down, but shafts Il, Il contact bars 8, 8 and cannot move down, but are forced to slide rearward until they contact lugs 26, 28. 'I'he front end of bucket I2 will continue to fall downward until it reaches the ground, shafts I8, I2 are set high enough above the bottom of bucket I2 that they will not contact bars 8, 8 at any time while the scraper is digging.

Also, when dog 25 is raised, releasing windlass 2l, the weight of plate I6 will cause it to fall downward, but shafts I1, I1 contact guides Il and cause the front end of plate Il to fall straight down until shafts I1. I1 rest on bars 8, 8. The rear end of plate I8 contacts bars 8, 8 at all times and cannot move downward, but is forced to slide rearward until it contacts the rear end of box I (Figure 2). The front end of bucket I2 can be raised or lowered for deep or shallow dissing at any time by turning crank 28.

When needed, idlers 21 (Figure 4) can be set over pipes 8 and I8 for cables I8 and 2li to roll on. Where desired, grooves can be cut in both sides of box I instead of attaching guides Il to engage shafts I1, I1.

For large scrapers the bottom of box I may be cut in several sections and any number of buckets I2 or plates I6 may be used, enabling quicker loading and unloading of the scraper.

Where desired, separate windlasses can be used, one for each bucket I2 and one for each plate I8 operated independent or together.

Where the windlass is set on the tractor, crank 22, sprocket 24 and dog 25 are removed and two revolving shafts 22, 22 are set side by side on bar l and through bar 28, one shaft 22 on each side of cable I9, allowing cable I9 to bend with the tractor as the tractor turns right or left.

Material left on bars 8, 8 after the scraper is unloadedV which might interfere with the operation of buckets I2 and plate I6 will be scraped off by shafts I4, I4 and the rear end of plate I8 as they slide back and forth, but holes may be cut in bars 8, 8 where shafts Il, I 4 contact lugs 28, 26 and where shafts I1, I1 rest on bars 8, 8 and that part of bars 8, 8 that are not scraped clean to allow the escape of the material.

Where desired, instead of using bars 8, 8, the two sides of box I may be wider than its two ends and the extra width bent at right angles at the bottom of the two sides of box I thus taking the place of and doing away with bars 8, 8.

Where desired to allow the materialto pass over bucket I2 and into box I, faster, the bottom part of the front end of box I may be cut out to any height desired above the bottom of box I up to the hitch 4; bucket I2 will necessarily be lengthened to operate as heretofore described.

I claim:

1. A carrying scraper having sides, front, and back rigidly connected together to form a rigid bowl, supported in ilxed elevation from the ground by ground engaging members, a bottom formed in sections, one end of each section mounted to slide along the lower edges of the bowl, means supporting the other end of each section to hold it in closing relation to the bottom of the bowl, and to raise the end to discharge the load through the opening formed by the sliding movement of the other end and the front end of the forward section being formed as a scoop to scoop material from the surface of the ground when lowered by its supporting means.

2. A carrying scraper having sides and back rigidly connected together to form a rigid bowl, supported in fixed elevation from the ground by ground engaging members,` a bottom formed in sections, one end of each section mounted to slide along the lower edges of the bowl, means supporting the other end of each section to hold it in closing relation to the bottom of the bowl and to raise the end to discharge the load through the opening formed by the sliding movement of the other end and the front end of the forward section being formed as a scoop to scoop matefront plate, means applied said plate to swing v the same about said pivot mounting, and means guiding the plate so that with upward swinging movement thereof from a. normal position, the pivot mountingwill move forwardly.

FRANK S. DOBSON. 

